Back to your test review

The O2 released in photosynthesis comes from

  • (a) pyruvic acid Your answer
  • (b) glucose Your answer
  • (c) water Correct
  • (d) CO2 Your answer
Your answer: Correct answer: (c)
Advertisement

Explanation

Why (c) is correct

The O2 released in photosynthesis comes from water, which is split in the light reaction. This was shown with water labelled with 18O.

Why the other options are wrong

  • (a) · your answer Pyruvic acid is not a source of O2 in photosynthesis.
  • (b) · your answer Glucose is a product, not a source of O2.
  • (d) · your answer Oxygen from CO2 goes into sugar and water, not into the O2 released.
NCERT point: Equation: 6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2.
What is wrong?
Thank you! We will check this question.
Practise Photosynthesis in Higher Plants
Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.
Start free test

Similar questions

C4 plants differ from C3 plants with respect to The Calvin cycle occurs in the A student takes soda water in a glass, adds chlorophyll to it and keeps it in sunlight, thinking that CO2, water, chloro…